Presentation on theme: "Behaviors & Reproduction of sharks"— Presentation transcript:
1Behaviors & Reproduction of sharks DesireeVictoriaMichael
2BehaviorsSharks have sensitive receptors, for the protection of stimuli.They have a lateral line organ, that detects vibrations and sounds over long distances.Sharks detect electric fields given off by other organisms, the tiny pores that detect them are called ampullae of Lorenzini.
3Behaviors (continued…) The contraction of powerful muscles allow them to move extremely fast.Many sharks have to be in constant motion, or they will sink to the bottom.Sharks have constant tooth growth.They have an oily liver, which increases shark buoyancy.
4Reproduction Internal fertilization Male sharks have claspers, which are located between their pelvic fins, that allow them to transfer sperm into females.Sharks have internal development.Sharks can stay inside their mmothers for a long time before even being born.They develop predatory instincts within their mother, and sometimes even eat their siblings.
6Erica Miles George Smith Jaleel McCrae Groups of Fish’sErica Miles George Smith Jaleel McCrae
7Jawless fishesOnly two classes of jawless fish Lampreys and Hag-FishesNo teeth or jawsNo VertebrateLamprey’s head takes up most of the bodyHagfish lack eyesHagfish feed on dead or dying fish
8Sharks and their relatives Class of ChondrichthyesRelatives are rays, skates, and a few uncommon fishesMost sharks has large curved tailsAlso has a torpedo shaped body and pointed snout.Not all sharks have fierce looking teeth
9Bony Fish Class of Osteichthyes Belong to a group called ray-finned fishes“ray-finned” refers to the slender bodyOther type of species is lobe-finned“lobe-finned” has supported bones
10How To Save Sharks! Tagging them. Catch limits and quotas for commercial and recreational fishing and have been put into effect to protect various shark species.Cut down fishing.
11Info About SharksShark is called an apex predator meaning that it is at the top of ocean food chain.Some sharks take as long as 15 years to mature.Sharks only reproduce once every two years and produce few off springSharks have cartilaginous skeleton, instead of a heavy bony skeleton like land animals.Sharks engage in different forms of communication. Although sharks are loners, they have the intelligence to communicate.
13What is a Cartilaginous Fish? Fish whose entire skeleton is composed of cartilage.They are jawed fishHave placid scales, tiny teeth that are deeply embedded in skinGill siltsRigid fin
14Cartilaginous Fish Cont. Breathing holes, called spiracles, located on thei dorsal side behind each eye.Ventral mouth (usually an adaptation for bottom feeding).Inhabit coastal waters from Virginia to Brazil& the gulf of Mexico.24 or more teeth that stick out on each side.Uses snout to stun & kill.
15Sharks 350 known species of sharks. Smallest shark is pigmy shark (25cm long)Largest of all fish- the whale shark
16Tyquan Morgan, Jordan Manns, Kimberly Whittaker FishesTyquan Morgan, Jordan Manns, Kimberly Whittaker
17General InfoFishes are aquatic vertebrates: most fishes have paired fins, scales, and gillsFins are used for movement, scales for protection, and gills exchanging gases.Fishes were the first vertebrates to evolve.
18Ancient FishesThe evolution of jaws and the evolution of paired fins were important developments during the rise of fishesThe earliest fishes to appear in the fossil record were odd-looking, jawless creatures whose bodies were armored with bony plates
19Form and Function in Fishes By Ebony McPhersonKenneth SherrodChaska Blackburn
20Basic Info.Adaptations to aquatic life includes various modes of feeding, specialized structures for gas exchange, and paired fins for locomotion.
21Feeding and Respiration Every mode of feeding is seen in fishes.There are herbivores, carnivores, parasites, filter feeders, and detritus feeders.One fish may exhibit multiple forms of feeding.Food goes down the esophagus and to the stomach where it is partially digested. In many fishes the food is further processed in pyloricceca.Most fish exchange gases through their gills, located on either side of the pharynx.Most fish have one gill opening on each side, but sharks and sea lampreys have multiple.
22Circulation and Excretion Fishes have closed circulatory systems with a heart that pumps blood around the body in a single loop.In most fishes the heart consists of four parts:The sinus venosus – a thin-walled sack that collects blood from the fishes veinsAtrium – a large, muscular chamber that serves as a one-way compartment for bloodVentricle – a thick-walled muscular chamber is the actual pumping portion of the heartBulbus Arteriosus – large, muscular tubeFishes rid themselves of nitrogenous wastes in the form of ammonia
23Response, Movement, and Reproduction Fishes have a well developed nervous system organized around a brain.Most fishes move by alternately contracting paired sets of muscles on either side of the backbone.The eggs of fishes are fertilized externally or internally, depending on the species.